Printing pastes from dyestuffs and process of preparing them



Patented May 3, 1932 UNITED STATES PATENT OFFICE ALBRECHT SCHMIDT, OF FRANKFORT-ONTHE-MAIN, GERMANY, ASSIGNOR TO GEN- ERAL ANILINE WORKS, INC., OF NEW YORK, N. Y., A CORPORATION OF DELAWARE IPRIN'JPIIIG PASTES FROM DYESTUFFS AND PROCESS OF PREPARING THEM No Drawing. Application filed September 19, 1928, Serial No. 307,053, and in Germany August 29, 1928.

The present invention relates to dyestuif pastes, particularly to printing pastes and a process of preparing such pastes.

When heating an urea or its derivatives with a large excess of an alcohol or' a ketone, preferably in the presence of a catalyst and while using pressure, new products of an oily ,or resinouscharacter are obtained (see British Patents Nos. 278,390; 280,238; 290,192; 292,595).

I have found that by adding the above mentionedproducts made by condensing a urea with products which may be characterized' by the formula :RX-, wherein R signij 35 fies an organic residue and X signifies the alcoholic OH-group or the COR-group, to dye-pastes, there are obtained printing pastes which give more intense prints, when used together with the usual printing and fixing agents, than the printing pastes made without any additionof the said products. The prints are distinguished b the fact, that they are not stained or spec led, but of great evenness. The addition of the condensing products in question has the further advantage, that between the printing and steaming operations the course of the process may be interrupted without the prints thereby becoming fainter, as it often happens in that case.

The products may be added either during the preparation of the printing color or when the color is made up into the commercial dyestufl paste. In some cases, it is advantageous, to effect the mixture of the dye-paste with the said products, while heating; thus, pastes are obtained which are extremely finely subdivided and do not form any deposits.

40 The addition of a sufiicient quantity of the condensation products to the commercial pastes involves the advantage that the detrimental formation of crusts is entirely avoided.

The following examples serve toillustrate the invention, but they are not intended to limit it thereto 1. 100 grams 2,1-naphthoxy thiophene- 2.3-dichloro-5'7-indolindigo of 20% strength, are mixed with 20 grams of the concentrated condensation product from urea and butylene glycol and the whole is concentrated to 100 grams. From this dye paste, a printing color is prepared by the following addition of: 40 grams of glycerine, 15 grams of sodium benzyl sulfanilate, grams of potash, 200 grams of wheat starch-tragacanth thickening and 'grams of formaldehyde-sodium sulfoxylate 1:1, the whole being made up with water to 500 grams.

2. 30 grams of glycerine and 20 grams of the condensation product from urea and butylene glycol are mixed with 40 grams of dyestuif No. 763 of 20 per cent strength, 40 grams of dyestuflf No. 842 of 20 per cent strength and 20 grams of dyestufi' No. 760 of 20 per cent stren h gsaid d estufi's being defined in Schultz Far stofi abellen 6th edition, 1923), the whole is evaporated to 100 grams. The printing color niay then be prepared in the same manner as indicated in Example 1.

I claim:

1. As new products, dyestuif pastes from d estufl's, containing condensation products 0 tained by heating a urea with an excess of a compound of the following eneral formula: Rr-X, wherein R si ni es an organic residue and X signifies t e alcoholic OH- group or the CO-R-group.

2. As new products, printing pastes from vat dyestuffs, containing condensation prod ucts obtained by heating urea with an excess of butylene glycol,

3. In a process of preparing dyestufi pastes the step which consists in mixing any color aste with a condensation product obtained y heating a urea with an excess of a compound of the following general formula: RX, wherein R signifies an organic residue 90 and X signifies the alcoholic OH-group or the COR-group, while heating.

4. In a process of preparing dyestufi pastes, the step which conslsts in mixmg a vat dyestuff paste with the condensatlon product obtained by heatin urea with an excess of butylene glycol, whlle heating.

5. As new products, dyestufi pastes containing a condensation product obtainable by heating a urea with an excess of a conipound of the following general formula: R'X, wherein R signifies an or anic residue and, X signifies the alcoholic H-group or I 6. As new products, vat dyestuif pastes containing a condensation product obtainable by heating a urea with an excess-of butylene glycol.

' 7. As a new product, a paste from 2.1-, naphthoxythiophene-2.3-dichloro-5.7'-indolindi 0 containing a condensation product obtainable by heating a urea with an excess of butylene glycol.

8. As a new product, a paste from a mix- .ture of the d estuifs Nos. 763, 842 and 760 of Schultz arbstofl'tabellen? 6th ed., 1923, in a proportion of 4:4:2 containing a condensation product obtainable by heating urea with an excess of butylene glycol.

In testimony whereof, I afiix my signature.

ALBRECHT SCHMIDT. 

